I have had a jumping afr at high rpm ! I am still chasing the demon... I was going to unplug my post cat 02 and start there. Is the short term fuel trim the same thing as a float afr at high rpm? I believe Jwick had the same problem as me. Sasa has been great with the help, the shop on the other hand refused to call him for some reason, so i took the car back and am driving it atm.
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